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Thu, 27 Aug 2026 08:07:43 +0000 (UTC) Date: Thu, 27 Aug 2026 17:07:40 +0900 From: Itaru Kitayama To: Sean Christopherson Cc: Marc Zyngier , Oliver Upton , Paolo Bonzini , Tianrui Zhao , Bibo Mao , Huacai Chen , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Fuad Tabba , Joey Gouly , Steffen Eiden , Suzuki K Poulose , Zenghui Yu , Atish Patra , Alexandre Ghiti , David Hildenbrand , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvm@vger.kernel.org, loongarch@lists.linux.dev, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Nicholas Piggin , Ritesh Harjani Subject: Re: [PATCH 00/20] KVM: selftests: PPC pre-enabling Message-ID: References: <20260826230511.972824-1-seanjc@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260826230511.972824-1-seanjc@google.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260827_010756_016938_154C4B8E X-CRM114-Status: GOOD ( 21.36 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Aug 26, 2026 at 04:04:51PM -0700, Sean Christopherson wrote: > This is a big pile of cleanups and refactoring to prepare for PPC support in > KVM selftests. PPC has paging modes that require multi-page page tables, and > those page tables need to be naturally aligned. The original proposal was to > plumb in an @align param to the page allocators[*], but I didn't love the idea > of adding another rarely used param to the allocators. > > Reworking the APIs to take a region type requires a fair bit of churn, and was > more painful than expected as I didn't realize just how many one-off tests did > weird things, but overall I think it's worth it? If only to keep cutting down > on the use of magic memslot numbers in tests. > > This needs explicit testing on s390. I tested on arm64 and x86, and given the > number of failures I had to wade through, I wouldn't be at all suprised if I > broke something subtle on s390 as well. > > I'm less concerned about RISC-V and LoongArch as they don't have any custom > tests that are affected (which is where I got burned). I ran kvm_page_table_test with this series applied on Grace CPUs. Passes across all the arm64 guest modes supported. Tested-by: Itaru Kitayama > > [*] https://lore.kernel.org/all/df86b5ccdbdafc3509d9538bd5e6796737bab2db.1781093720.git.ritesh.list@gmail.com > > Nicholas Piggin (1): > KVM: selftests: Use goto instead of do-while to retry finding unused > physical pages > > Sean Christopherson (19): > KVM: selftests: Use MEM_REGION_PT memslot instead of '0' for s390 > regions/segments > KVM: selftests: Bump the minimum GPA for page tables to 0x200000 > KVM: selftests: Use vm_alloc_page_table() to allocate LoongArch page > tables > KVM: selftests: Rename "num" param to "nr_pages" for physical page > allocators > KVM: selftests: Extend page allocator to support naturally aligned > allocations > KVM: selftests: Make the single-page allocator APIs static inline > KVM: selftests: Use the innermost page allocator API in the memslot > perf test > KVM: selftests: Use the innermost page allocator API in s390's IRQ > routing test > KVM: selftests: Add a wrapper API to allocate multiple page table > pages > KVM: selftests: Initialize vm->memslots[] with invalid memslots during > creation > KVM: selftests: Add APIs to override memory region types with custom > memslots > KVM: selftests: Add TEST_EXTRA memory region type for "special" > memslots > KVM: selftests: Use TEST_EXTRA region in arm64's vGIC LPI stress test > KVM: selftests: Use TEST_EXTRA region in x86's smaller MAXPHYADDR test > KVM: selftests: Use TEST_EXTRA region in set memory region test > KVM: selftests: Take the memory region type, not memslot, in page > allocators > KVM: selftests: Use TEST_ASSERT(), not assert(), in > vm_get_mem_region() > KVM: selftests: Automatically pick min_gpa for allocations based on > region type > KVM: selftests: Add arch hook to force page tables to be naturally > aligned > > .../selftests/kvm/arm64/page_fault_test.c | 18 ++- > .../selftests/kvm/arm64/vgic_lpi_stress.c | 19 ++- > .../testing/selftests/kvm/include/kvm_util.h | 106 +++++++++++++-- > tools/testing/selftests/kvm/include/x86/smm.h | 2 +- > .../selftests/kvm/lib/arm64/processor.c | 4 +- > tools/testing/selftests/kvm/lib/kvm_util.c | 127 +++++++++++------- > .../selftests/kvm/lib/loongarch/processor.c | 5 +- > .../selftests/kvm/lib/riscv/processor.c | 4 +- > .../selftests/kvm/lib/s390/processor.c | 7 +- > .../testing/selftests/kvm/lib/x86/processor.c | 15 ++- > .../testing/selftests/kvm/memslot_perf_test.c | 3 +- > tools/testing/selftests/kvm/s390/cmma_test.c | 19 +-- > .../testing/selftests/kvm/s390/irq_routing.c | 2 +- > .../selftests/kvm/set_memory_region_test.c | 8 +- > .../x86/smaller_maxphyaddr_emulation_test.c | 9 +- > 15 files changed, 219 insertions(+), 129 deletions(-) > > > base-commit: 76671054f9a1ff6abb976583cd8da37650acdc97 > -- > 2.55.0.887.g758fc8c411-goog >